/* $Id: ebus.c,v 1.64 2001/11/08 04:41:33 davem Exp $
* ebus.c: PCI to EBus bridge device.
*
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pbm.h>
#include <asm/ebus.h>
#include <asm/oplib.h>
#include <asm/bpp.h>
#include <asm/irq.h>
/* EBUS dma library. */
#define EBDMA_CSR 0x00UL /* Control/Status */
#define EBDMA_ADDR 0x04UL /* DMA Address */
#define EBDMA_COUNT 0x08UL /* DMA Count */
#define EBDMA_CSR_INT_PEND 0x00000001
#define EBDMA_CSR_ERR_PEND 0x00000002
#define EBDMA_CSR_DRAIN 0x00000004
#define EBDMA_CSR_INT_EN 0x00000010
#define EBDMA_CSR_RESET 0x00000080
#define EBDMA_CSR_WRITE 0x00000100
#define EBDMA_CSR_EN_DMA 0x00000200
#define EBDMA_CSR_CYC_PEND 0x00000400
#define EBDMA_CSR_DIAG_RD_DONE 0x00000800
#define EBDMA_CSR_DIAG_WR_DONE 0x00001000
#define EBDMA_CSR_EN_CNT 0x00002000
#define EBDMA_CSR_TC 0x00004000
#define EBDMA_CSR_DIS_CSR_DRN 0x00010000
#define EBDMA_CSR_BURST_SZ_MASK 0x000c0000
#define EBDMA_CSR_BURST_SZ_1 0x00080000
#define EBDMA_CSR_BURST_SZ_4 0x00000000
#define EBDMA_CSR_BURST_SZ_8 0x00040000
#define EBDMA_CSR_BURST_SZ_16 0x000c0000
#define EBDMA_CSR_DIAG_EN 0x00100000
#define EBDMA_CSR_DIS_ERR_PEND 0x00400000
#define EBDMA_CSR_TCI_DIS 0x00800000
#define EBDMA_CSR_EN_NEXT 0x01000000
#define EBDMA_CSR_DMA_ON 0x02000000
#define EBDMA_CSR_A_LOADED 0x04000000
#define EBDMA_CSR_NA_LOADED 0x08000000
#define EBDMA_CSR_DEV_ID_MASK 0xf0000000
#define EBUS_DMA_RESET_TIMEOUT 10000
static void __ebus_dma_reset(struct ebus_dma_info *p, int no_drain)
{
int i;
u32 val = 0;
writel(EBDMA_CSR_RESET, p->regs + EBDMA_CSR);
udelay(1);
if (no_drain)
return;
for (i = EBUS_DMA_RESET_TIMEOUT; i > 0; i--) {
val = readl(p->regs + EBDMA_CSR);
if (!(val & (EBDMA_CSR_DRAIN | EBDMA_CSR_CYC_PEND)))
break;
udelay(10);
}
}
static irqreturn_t ebus_dma_irq(int irq, void *dev_id, struct pt_regs *regs)
{
struct ebus_dma_info *p = dev_id;
unsigned long flags;
u32 csr = 0;
spin_lock_irqsave(&p->lock, flags);
csr = readl(p->regs + EBDMA_CSR);
writel(csr, p->regs + EBDMA_CSR);
spin_unlock_irqrestore(&p->lock, flags);
if (csr & EBDMA_CSR_ERR_PEND) {
printk(KERN_CRIT "ebus_dma(%s): DMA error!\n", p->name);
p->callback(p, EBUS_DMA_EVENT_ERROR, p->client_cookie);
return IRQ_HANDLED;
} else if (csr & EBDMA_CSR_INT_PEND) {
p->callback(p,
(csr & EBDMA_CSR_TC) ?
EBUS_DMA_EVENT_DMA : EBUS_DMA_EVENT_DEVICE,
p->client_cookie);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
int ebus_dma_register(struct ebus_dma_info *p)
{
u32 csr;
if (!p->regs)
return -EINVAL;
if (p->flags & ~(EBUS_DMA_FLAG_USE_EBDMA_HANDLER |
EBUS_DMA_FLAG_TCI_DISABLE))
return -EINVAL;
if ((p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) && !p->callback)
return -EINVAL;
if (!strlen(p->name))
return -EINVAL;
__ebus_dma_reset(p, 1);
csr = EBDMA_CSR_BURST_SZ_16 | EBDMA_CSR_EN_CNT;
if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
csr |= EBDMA_CSR_TCI_DIS;
writel(csr, p->regs + EBDMA_CSR);
return 0;
}
EXPORT_SYMBOL(ebus_dma_register);
int ebus_dma_irq_enable(struct ebus_dma_info *p, int on)
{
unsigned long flags;
u32 csr;
if (on) {
if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
if (request_irq(p->irq, ebus_dma_irq, SA_SHIRQ, p->name, p))
return -EBUSY;
}
spin_lock_irqsave(&p->lock, flags);
csr = readl(p->regs + EBDMA_CSR);
csr |= EBDMA_CSR_INT_EN;
writel(csr, p->regs + EBDMA_CSR);
spin_unlock_irqrestore(&p->lock, flags);
} else {
spin_lock_irqsave(&p->lock, flags);
csr = readl(p->regs + EBDMA_CSR);
csr &= ~EBDMA_CSR_INT_EN;
writel(csr, p->regs + EBDMA_CSR);
spin_unlock_irqrestore(&p->lock, flags);
if (p->flags & EBUS_DMA_FLAG_USE_EBDMA_HANDLER) {
free_irq(p->irq, p);
}
}
return 0;
}
EXPORT_SYMBOL(ebus_dma_irq_enable);
void ebus_dma_unregister(struct ebus_dma_info *p)
{
unsigned long flags;
u32 csr;
int irq_on = 0;
spin_lock_irqsave(&p->lock, flags);
csr = readl(p->regs + EBDMA_CSR);
if (csr & EBDMA_CSR_INT_EN) {
csr &= ~EBDMA_CSR_INT_EN;
writel(csr, p->regs + EBDMA_CSR);
irq_on = 1;
}
spin_unlock_irqrestore(&p->lock, flags);
if (irq_on)
free_irq(p->irq, p);
}
EXPORT_SYMBOL(ebus_dma_unregister);
int ebus_dma_request(struct ebus_dma_info *p, dma_addr_t bus_addr, size_t len)
{
unsigned long flags;
u32 csr;
int err;
if (len >= (1 << 24))
return -EINVAL;
spin_lock_irqsave(&p->lock, flags);
csr = readl(p->regs + EBDMA_CSR);
err = -EINVAL;
if (!(csr & EBDMA_CSR_EN_DMA))
goto out;
err = -EBUSY;
if (csr & EBDMA_CSR_NA_LOADED)
goto out;
writel(len, p->regs + EBDMA_COUNT);
writel(bus_addr, p->regs + EBDMA_ADDR);
err = 0;
out:
spin_unlock_irqrestore(&p->lock, flags);
return err;
}
EXPORT_SYMBOL(ebus_dma_request);
void ebus_dma_prepare(struct ebus_dma_info *p, int write)
{
unsigned long flags;
u32 csr;
spin_lock_irqsave(&p->lock, flags);
__ebus_dma_reset(p, 0);
csr = (EBDMA_CSR_INT_EN |
EBDMA_CSR_EN_CNT |
EBDMA_CSR_BURST_SZ_16 |
EBDMA_CSR_EN_NEXT);
if (write)
csr |= EBDMA_CSR_WRITE;
if (p->flags & EBUS_DMA_FLAG_TCI_DISABLE)
csr |= EBDMA_CSR_TCI_DIS;
writel(csr, p->regs + EBDMA_CSR);
spin_unlock_irqrestore(&p->lock, flags);
}
EXPORT_SYMBOL(ebus_dma_prepare);
unsigned int ebus_dma_residue(struct ebus_dma_info *p)
{
return readl(p->regs + EBDMA_COUNT);
}
EXPORT_SYMBOL(ebus_dma_residue);
unsigned int ebus_dma_addr(struct ebus_dma_info *p)
{
return readl(p->regs + EBDMA_ADDR);
}
EXPORT_SYMBOL(ebus_dma_addr);
void ebus_dma_enable(struct ebus_dma_info *p, int on)
{
unsigned long flags;
u32 orig_csr, csr;
spin_lock_irqsave(&p->lock, flags);
orig_csr = csr = readl(p->regs + EBDMA_CSR);
if (on)
csr |= EBDMA_CSR_EN_DMA;
else
csr &= ~EBDMA_CSR_EN_DMA;
if ((orig_csr & EBDMA_CSR_EN_DMA) !=
(csr & EBDMA_CSR_EN_DMA))
writel(csr, p->regs + EBDMA_CSR);
spin_unlock_irqrestore(&p->lock, flags);
}
EXPORT_SYMBOL(ebus_dma_enable);
struct linux_ebus *ebus_chain = NULL;
#ifdef CONFIG_SUN_AUXIO
extern void auxio_probe(void);
#endif
static inline void *ebus_alloc(size_t size)
{
void *mem;
mem = kmalloc(size, GFP_ATOMIC);
if (!mem)
panic("ebus_alloc: out of memory");
memset((char *)mem, 0, size);
return mem;
}
static void __init ebus_ranges_init(struct linux_ebus *ebus)
{
int success;
ebus->num_ebus_ranges = 0;
success = prom_getproperty(ebus->prom_node, "ranges",
(char *)ebus->ebus_ranges,
sizeof(ebus->ebus_ranges));
if (success != -1)
ebus->num_ebus_ranges = (success/sizeof(struct linux_prom_ebus_ranges));
}
static void __init ebus_intmap_init(struct linux_ebus *ebus)
{
int success;
ebus->num_ebus_intmap = 0;
success = prom_getproperty(ebus->prom_node, "interrupt-map",
(char *)ebus->ebus_intmap,
sizeof(ebus->ebus_intmap));
if (success == -1)
return;
ebus->num_ebus_intmap = (success/sizeof(struct linux_prom_ebus_intmap));
success = prom_getproperty(ebus->prom_node, "interrupt-map-mask",
(char *)&ebus->ebus_intmask,
sizeof(ebus->ebus_intmask));
if (success == -1) {
prom_printf("%s: can't get interrupt-map-mask\n", __FUNCTION__);
prom_halt();
}
}
int __init ebus_intmap_match(struct linux_ebus *ebus,
struct linux_prom_registers *reg,
int *interrupt)
{
unsigned int hi, lo, irq;
int i;
if (!ebus->num_ebus_intmap)
return 0;
hi = reg->which_io & ebus->ebus_intmask.phys_hi;
lo = reg->phys_addr & ebus->ebus_intmask.phys_lo;
irq = *interrupt & ebus->ebus_intmask.interrupt;
for (i = 0; i < ebus->num_ebus_intmap; i++) {
if ((ebus->ebus_intmap[i].phys_hi == hi) &&
(ebus->ebus_intmap[i].phys_lo == lo) &&
(ebus->ebus_intmap[i].interrupt == irq)) {
*interrupt = ebus->ebus_intmap[i].cinterrupt;
return 0;
}
}
return -1;
}
void __init fill_ebus_child(int node, struct linux_prom_registers *preg,
struct linux_ebus_child *dev, int non_standard_regs)
{
int regs[PROMREG_MAX];
int irqs[PROMREG_MAX];
int i, len;
dev->prom_node = node;
prom_getstring(node, "name", dev->prom_name, sizeof(dev->prom_name));
printk(" (%s)", dev->prom_name);
len = prom_getproperty(node, "reg", (void *)regs, sizeof(regs));
dev->num_addrs = len / sizeof(regs[0]);
if (non_standard_regs) {
/* This is to handle reg properties which are not
* in the parent relative format. One example are
* children of the i2c device on CompactPCI systems.
*
* So, for such devices we just record the property
* raw in the child resources.
*/
for (i = 0; i < dev->num_addrs; i++)
dev->resource[i].start = regs[i];
} else {
for (i = 0; i < dev->num_addrs; i++) {
int rnum = regs[i];
if (rnum >= dev->parent->num_addrs) {
prom_printf("UGH: property for %s was %d, need < %d\n",
dev->prom_name, len, dev->parent->num_addrs);
panic(__FUNCTION__);
}
dev->resource[i].start = dev->parent->resource[i].start;
dev->resource[i].end = dev->parent->resource[i].end;
dev->resource[i].flags = IORESOURCE_MEM;
dev->resource[i].name = dev->prom_name;
}
}
for (i = 0; i < PROMINTR_MAX; i++)
dev->irqs[i] = PCI_IRQ_NONE;
len = prom_getproperty(node, "interrupts", (char *)&irqs, sizeof(irqs));
if ((len == -1) || (len == 0)) {
dev->num_irqs = 0;
/*
* Oh, well, some PROMs don't export interrupts
* property to children of EBus devices...
*
* Be smart about PS/2 keyboard and mouse.
*/
if (!strcmp(dev->parent->prom_name, "8042")) {
if (!strcmp(dev->prom_name, "kb_ps2")) {
dev->num_irqs = 1;
dev->irqs[0] = dev->parent->irqs[0];
} else {
dev->num_irqs = 1;
dev->irqs[0] = dev->parent->irqs[1];
}
}
} else {
dev->num_irqs = len / sizeof(irqs[0]);
for (i = 0; i < dev->num_irqs; i++) {
struct pci_pbm_info *pbm = dev->bus->parent;
struct pci_controller_info *p = pbm->parent;
if (ebus_intmap_match(dev->bus, preg, &irqs[i]) != -1) {
dev->irqs[i] = p->irq_build(pbm,
dev->bus->self,
irqs[i]);
} else {
/* If we get a bogus interrupt property, just
* record the raw value instead of punting.
*/
dev->irqs[i] = irqs[i];
}
}
}
}
static int __init child_regs_nonstandard(struct linux_ebus_device *dev)
{
if (!strcmp(dev->prom_name, "i2c") ||
!strcmp(dev->prom_name, "SUNW,lombus"))
return 1;
return 0;
}
void __init fill_ebus_device(int node, struct linux_ebus_device *dev)
{
struct linux_prom_registers regs[PROMREG_MAX];
struct linux_ebus_child *child;
int irqs[PROMINTR_MAX];
int i, n, len;
dev->prom_node = node;
prom_getstring(node, "name", dev->prom_name, sizeof(dev->prom_name));
printk(" [%s", dev->prom_name);
len = prom_getproperty(node, "reg", (void *)regs, sizeof(regs));
if (len == -1) {
dev->num_addrs = 0;
goto probe_interrupts;
}
if (len % sizeof(struct linux_prom_registers)) {
prom_printf("UGH: proplen for %s was %d, need multiple of %d\n",
dev->prom_name, len,
(int)sizeof(struct linux_prom_registers));
prom_halt();
}
dev->num_addrs = len / sizeof(struct linux_prom_registers);
for (i = 0; i < dev->num_addrs; i++) {
/* XXX Learn how to interpret ebus ranges... -DaveM */
if (regs[i].which_io >= 0x10)
n = (regs[i].which_io - 0x10) >> 2;
else
n = regs[i].which_io;
dev->resource[i].start = dev->bus->self->resource[n].start;
dev->resource[i].start += (unsigned long)regs[i].phys_addr;
dev->resource[i].end =
(dev->resource[i].start + (unsigned long)regs[i].reg_size - 1UL);
dev->resource[i].flags = IORESOURCE_MEM;
dev->resource[i].name = dev->prom_name;
request_resource(&dev->bus->self->resource[n],
&dev->resource[i]);
}
probe_interrupts:
for (i = 0; i < PROMINTR_MAX; i++)
dev->irqs[i] = PCI_IRQ_NONE;
len = prom_getproperty(node, "interrupts", (char *)&irqs, sizeof(irqs));
if ((len == -1) || (len == 0)) {
dev->num_irqs = 0;
} else {
dev->num_irqs = len / sizeof(irqs[0]);
for (i = 0; i < dev->num_irqs; i++) {
struct pci_pbm_info *pbm = dev->bus->parent;
struct pci_controller_info *p = pbm->parent;
if (ebus_intmap_match(dev->bus, ®s[0], &irqs[i]) != -1) {
dev->irqs[i] = p->irq_build(pbm,
dev->bus->self,
irqs[i]);
} else {
/* If we get a bogus interrupt property, just
* record the raw value instead of punting.
*/
dev->irqs[i] = irqs[i];
}
}
}
if ((node = prom_getchild(node))) {
printk(" ->");
dev->children = ebus_alloc(sizeof(struct linux_ebus_child));
child = dev->children;
child->next = NULL;
child->parent = dev;
child->bus = dev->bus;
fill_ebus_child(node, ®s[0],
child, child_regs_nonstandard(dev));
while ((node = prom_getsibling(node)) != 0) {
child->next = ebus_alloc(sizeof(struct linux_ebus_child));
child = child->next;
child->next = NULL;
child->parent = dev;
child->bus = dev->bus;
fill_ebus_child(node, ®s[0],
child, child_regs_nonstandard(dev));
}
}
printk("]");
}
static struct pci_dev *find_next_ebus(struct pci_dev *start, int *is_rio_p)
{
struct pci_dev *pdev = start;
do {
pdev = pci_find_device(PCI_VENDOR_ID_SUN, PCI_ANY_ID, pdev);
if (pdev &&
(pdev->device == PCI_DEVICE_ID_SUN_EBUS ||
pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS))
break;
} while (pdev != NULL);
if (pdev && (pdev->device == PCI_DEVICE_ID_SUN_RIO_EBUS))
*is_rio_p = 1;
else
*is_rio_p = 0;
return pdev;
}
void __init ebus_init(void)
{
struct pci_pbm_info *pbm;
struct linux_ebus_device *dev;
struct linux_ebus *ebus;
struct pci_dev *pdev;
struct pcidev_cookie *cookie;
int nd, ebusnd, is_rio;
int num_ebus = 0;
pdev = find_next_ebus(NULL, &is_rio);
if (!pdev) {
printk("ebus: No EBus's found.\n");
return;
}
cookie = pdev->sysdata;
ebusnd = cookie->prom_node;
ebus_chain = ebus = ebus_alloc(sizeof(struct linux_ebus));
ebus->next = NULL;
ebus->is_rio = is_rio;
while (ebusnd) {
/* SUNW,pci-qfe uses four empty ebuses on it.
I think we should not consider them here,
as they have half of the properties this
code expects and once we do PCI hot-plug,
we'd have to tweak with the ebus_chain
in the runtime after initialization. -jj */
if (!prom_getchild (ebusnd)) {
pdev = find_next_ebus(pdev, &is_rio);
if (!pdev) {
if (ebus == ebus_chain) {
ebus_chain = NULL;
printk("ebus: No EBus's found.\n");
return;
}
break;
}
ebus->is_rio = is_rio;
cookie = pdev->sysdata;
ebusnd = cookie->prom_node;
continue;
}
printk("ebus%d:", num_ebus);
prom_getstring(ebusnd, "name", ebus->prom_name, sizeof(ebus->prom_name));
ebus->index = num_ebus;
ebus->prom_node = ebusnd;
ebus->self = pdev;
ebus->parent = pbm = cookie->pbm;
ebus_ranges_init(ebus);
ebus_intmap_init(ebus);
nd = prom_getchild(ebusnd);
if (!nd)
goto next_ebus;
ebus->devices = ebus_alloc(sizeof(struct linux_ebus_device));
dev = ebus->devices;
dev->next = NULL;
dev->children = NULL;
dev->bus = ebus;
fill_ebus_device(nd, dev);
while ((nd = prom_getsibling(nd)) != 0) {
dev->next = ebus_alloc(sizeof(struct linux_ebus_device));
dev = dev->next;
dev->next = NULL;
dev->children = NULL;
dev->bus = ebus;
fill_ebus_device(nd, dev);
}
next_ebus:
printk("\n");
pdev = find_next_ebus(pdev, &is_rio);
if (!pdev)
break;
cookie = pdev->sysdata;
ebusnd = cookie->prom_node;
ebus->next = ebus_alloc(sizeof(struct linux_ebus));
ebus = ebus->next;
ebus->next = NULL;
ebus->is_rio = is_rio;
++num_ebus;
}
#ifdef CONFIG_SUN_AUXIO
auxio_probe();
#endif
}
